I guess the point in that thread is in the 2nd page: the OP changed the hard disk and solved the problem that way. I do not know if you're willing to do that since you would have to transfer all the content of the old disk onto the new one and there is a non-zero risk to compromise the OSs actually installed; however with tools like Clonezilla or similar can be surprisingly a smooth process.

Anyway, as I have wrote earlier in this thread, you are already fine with the number of partitions: you have 3 primary in use for Win7 and you need to create just 1 extended partition for Linux [see this for reference]. The latter, which just counts as one partition, can be considered as a container for extended partitions; you're going to use those different sub-partitions as mount points for /, /boot, /swap, /home, etc... Another nice and flexible solution is LVM, which again would just count as 1 partition.

I hope this would clarify and help.

i cant use clonezilla right now, i dont have a usb hd to storage my whole windows 7 OS. and again, i tried all the partitioning posted a this and many other forums; none worked for me. i just dont understand why its so hard
just to install linux...

Also, if i install a 2nd hard drive, the same thing will happen. Some people here posted the same problem with
there 2nd hard drive. no point in buying one if the same thing is ganna happen.

Just to clarify that, you can have much more than 4 partitions on a harddisk. The limit you speak of is that you can have a maximum of 4 primary partitions on a harddisk (if you use the classic MBR, not the newer GPT), but if you use only three primary partitions and an extended partition you can create many logical partitions in the extended partition. The Ubuntu installer normally should take care of something like that.

i fixed the problem, it was a raid issue.